docs: fix typo in Java-Plugin-Development-Guide.md (#6463)
docs: fix typo in Java-Plugin-Development-Guide.md (#6463)


apache/skywalking,ascrutae/sky-walking,apache/skywalking,apache/skywalking,ascrutae/sky-walking,OpenSkywalking/skywalking,apache/skywalking,OpenSkywalking/skywalking,ascrutae/sky-walking,apache/skywalking,apache/skywalking,ascrutae/sky-walking,apache/skywalking